We determine the semantic and structural relations
between concepts according to the WordNet ontology, and
compute the semantic similarity with the graphic structure
composed of concept relations according to the distance,
density and depth between concepts to reflect the semantic
relations between concepts for the later work [9]. The closer
distance, the deeper depth, and the higher distance between
the concepts, the more similar of the concepts are. In the
same circumstances, concepts further to the root are more
semantically and structurally similar than the nearer ones to
the root. So this paper takes the depth, distance and distance
as the factors of similarity calculation.